Dell E152FPc Service Manual download pdf (Page 28)

DELL E152FPc

8.2 TROUBLE SHOOTING

8.2.1 MAIN BOARD

1.NO SCREEN APPEAR

Note: 1. If Replace “MAIN-BOARD”, Please re-do “DDC-content” programmed & “WHITE-Balance”.

2. If Replace “Inverter Board” only, Please re-do “ WHITE-Balance”

Yes, all DC level exist

o DC Level

Measured U402 pin 3 = 5 V?

Measured U402 pin 2= 3.3V?

Measured U401pin 2 =1.8V?

Check Power board, is there DC level output?

Check Correspondent component.

Is there any shortage or cold solder?

Check Power Board.

Yes. there have OSD show

Disconnected the Signal cable (Loose the

Signal cable), Is the screen show Block

WRGB color bars?

Connected the Signal cable again,

Check LED status.

Led Green

Replace U200

Scalar IC

No, nothing is show

Connected the Signal cable again,

Check LED status.

Check Power switch is in Power-on

status, and check if Power switch

had been stuck?

Led Orange

OK, Keyboard no stuck

Led orange

Led Green

Check the Wire-Harness from CN301

Measured RGB (R116, R106, R111) H, V

Input at U200 pin 85,86, was there have

signal?

Check Correspondent

component short/open

(Protection Diode)

and Signal cable bad ?

OK, Wire tight enough

Check Panel-Power Circuit Block

OK, Panel Power OK

Check U200 Data-output Block

OK, U200 data OK

Replace Inverter board and Check

Inverter control relative circuit

Re-do White balance adjust

OK, input Normal

Measured Crystal X200 (12.00MHz)

OK, clock normal

Replace U200 (GMZan3)

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Dell E152FPc Service Manual Page 28

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